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# Ch12 speedsection2

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### Ch12 speedsection2

1. 2. Motion and Force <ul><li>Chapter Twelve: Distance, Time, and Speed </li></ul><ul><li>Chapter Thirteen: Forces </li></ul><ul><li>Chapter Fourteen: Force and Motion </li></ul>
2. 3. Chapter Twelve: Distance, Time, and Speed <ul><li>12.1 Distance, Direction, and Position </li></ul><ul><li>12.2 Speed </li></ul><ul><li>12.3 Graphs of Motion </li></ul>
3. 4. Investigation 12A <ul><li>How do scientists describe motion? </li></ul>Distance, Time, and Speed
4. 5. 12.2 Speed <ul><li>Speed is the most common measurement used to describe the motion of objects . </li></ul><ul><li>Once you know an object’s speed, you can figure out how far it can go in a certain amount of time. </li></ul><ul><li>You can also predict how long it will take to get somewhere. </li></ul>
5. 6. 12.2 Speed <ul><li>The speed of a bicycle is the distance it travels divided by the time it takes. </li></ul>
6. 7. 12.2 Velocity <ul><li>Speed with direction is called velocity . </li></ul>
7. 8. 12.2 Constant Velocity <ul><li>A plane with a constant velocity of 600 km/h west moves in a straight line. (Its speed and direction remain the same.) </li></ul><ul><li>A car going around a bend at a constant 30 mph has a constant speed , but its velocity is not constant. (Note the change in direction.) </li></ul>
8. 9. 12.2 Average Speed <ul><li>The speed found by dividing the total distance by the total time is the average speed . </li></ul>
9. 10. 12.2 Relationships between distance, speed and time <ul><li>An equation can be used to calculate speed, distance, or time if two of the three values are known. </li></ul>
10. 12. Activity <ul><li>Speed is how fast something moves in relation to a reference point without regard to the direction. </li></ul><ul><li>In this activity you and a partner will each calculate your average speed in different units. </li></ul>How Fast are You?